Mercurial > hg > Members > tobaru > cbc > CbC_llvm
annotate lib/Analysis/IVUsers.cpp @ 3:9ad51c7bc036
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author | Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> |
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date | Wed, 15 May 2013 06:43:32 +0900 |
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children | 54457678186b |
rev | line source |
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3
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1 //===- IVUsers.cpp - Induction Variable Users -------------------*- C++ -*-===// |
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2 // |
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3 // The LLVM Compiler Infrastructure |
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4 // |
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5 // This file is distributed under the University of Illinois Open Source |
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6 // License. See LICENSE.TXT for details. |
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7 // |
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8 //===----------------------------------------------------------------------===// |
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9 // |
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10 // This file implements bookkeeping for "interesting" users of expressions |
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11 // computed from induction variables. |
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12 // |
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13 //===----------------------------------------------------------------------===// |
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14 |
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15 #define DEBUG_TYPE "iv-users" |
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16 #include "llvm/Analysis/IVUsers.h" |
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17 #include "llvm/ADT/STLExtras.h" |
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18 #include "llvm/Analysis/Dominators.h" |
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19 #include "llvm/Analysis/LoopPass.h" |
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20 #include "llvm/Analysis/ScalarEvolutionExpressions.h" |
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21 #include "llvm/Analysis/ValueTracking.h" |
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22 #include "llvm/Assembly/Writer.h" |
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23 #include "llvm/IR/Constants.h" |
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24 #include "llvm/IR/DataLayout.h" |
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25 #include "llvm/IR/DerivedTypes.h" |
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26 #include "llvm/IR/Instructions.h" |
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27 #include "llvm/IR/Type.h" |
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28 #include "llvm/Support/Debug.h" |
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29 #include "llvm/Support/raw_ostream.h" |
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30 #include <algorithm> |
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31 using namespace llvm; |
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32 |
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33 char IVUsers::ID = 0; |
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34 INITIALIZE_PASS_BEGIN(IVUsers, "iv-users", |
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35 "Induction Variable Users", false, true) |
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36 INITIALIZE_PASS_DEPENDENCY(LoopInfo) |
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37 INITIALIZE_PASS_DEPENDENCY(DominatorTree) |
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38 INITIALIZE_PASS_DEPENDENCY(ScalarEvolution) |
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39 INITIALIZE_PASS_END(IVUsers, "iv-users", |
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40 "Induction Variable Users", false, true) |
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41 |
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42 Pass *llvm::createIVUsersPass() { |
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43 return new IVUsers(); |
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44 } |
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45 |
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46 /// isInteresting - Test whether the given expression is "interesting" when |
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47 /// used by the given expression, within the context of analyzing the |
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48 /// given loop. |
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49 static bool isInteresting(const SCEV *S, const Instruction *I, const Loop *L, |
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50 ScalarEvolution *SE, LoopInfo *LI) { |
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51 // An addrec is interesting if it's affine or if it has an interesting start. |
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52 if (const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(S)) { |
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53 // Keep things simple. Don't touch loop-variant strides unless they're |
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54 // only used outside the loop and we can simplify them. |
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55 if (AR->getLoop() == L) |
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56 return AR->isAffine() || |
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57 (!L->contains(I) && |
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58 SE->getSCEVAtScope(AR, LI->getLoopFor(I->getParent())) != AR); |
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59 // Otherwise recurse to see if the start value is interesting, and that |
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60 // the step value is not interesting, since we don't yet know how to |
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61 // do effective SCEV expansions for addrecs with interesting steps. |
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62 return isInteresting(AR->getStart(), I, L, SE, LI) && |
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63 !isInteresting(AR->getStepRecurrence(*SE), I, L, SE, LI); |
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64 } |
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65 |
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66 // An add is interesting if exactly one of its operands is interesting. |
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67 if (const SCEVAddExpr *Add = dyn_cast<SCEVAddExpr>(S)) { |
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68 bool AnyInterestingYet = false; |
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69 for (SCEVAddExpr::op_iterator OI = Add->op_begin(), OE = Add->op_end(); |
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70 OI != OE; ++OI) |
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71 if (isInteresting(*OI, I, L, SE, LI)) { |
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72 if (AnyInterestingYet) |
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73 return false; |
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74 AnyInterestingYet = true; |
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75 } |
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76 return AnyInterestingYet; |
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77 } |
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78 |
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79 // Nothing else is interesting here. |
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80 return false; |
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81 } |
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82 |
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83 /// Return true if all loop headers that dominate this block are in simplified |
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84 /// form. |
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85 static bool isSimplifiedLoopNest(BasicBlock *BB, const DominatorTree *DT, |
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86 const LoopInfo *LI, |
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87 SmallPtrSet<Loop*,16> &SimpleLoopNests) { |
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88 Loop *NearestLoop = 0; |
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89 for (DomTreeNode *Rung = DT->getNode(BB); |
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90 Rung; Rung = Rung->getIDom()) { |
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91 BasicBlock *DomBB = Rung->getBlock(); |
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92 Loop *DomLoop = LI->getLoopFor(DomBB); |
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93 if (DomLoop && DomLoop->getHeader() == DomBB) { |
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94 // If the domtree walk reaches a loop with no preheader, return false. |
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95 if (!DomLoop->isLoopSimplifyForm()) |
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96 return false; |
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97 // If we have already checked this loop nest, stop checking. |
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98 if (SimpleLoopNests.count(DomLoop)) |
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99 break; |
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100 // If we have not already checked this loop nest, remember the loop |
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101 // header nearest to BB. The nearest loop may not contain BB. |
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102 if (!NearestLoop) |
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103 NearestLoop = DomLoop; |
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104 } |
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105 } |
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106 if (NearestLoop) |
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107 SimpleLoopNests.insert(NearestLoop); |
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108 return true; |
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109 } |
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110 |
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111 /// AddUsersImpl - Inspect the specified instruction. If it is a |
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112 /// reducible SCEV, recursively add its users to the IVUsesByStride set and |
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113 /// return true. Otherwise, return false. |
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114 bool IVUsers::AddUsersImpl(Instruction *I, |
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115 SmallPtrSet<Loop*,16> &SimpleLoopNests) { |
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116 // Add this IV user to the Processed set before returning false to ensure that |
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117 // all IV users are members of the set. See IVUsers::isIVUserOrOperand. |
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118 if (!Processed.insert(I)) |
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119 return true; // Instruction already handled. |
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120 |
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121 if (!SE->isSCEVable(I->getType())) |
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122 return false; // Void and FP expressions cannot be reduced. |
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123 |
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124 // IVUsers is used by LSR which assumes that all SCEV expressions are safe to |
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125 // pass to SCEVExpander. Expressions are not safe to expand if they represent |
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126 // operations that are not safe to speculate, namely integer division. |
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127 if (!isa<PHINode>(I) && !isSafeToSpeculativelyExecute(I, TD)) |
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128 return false; |
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129 |
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130 // LSR is not APInt clean, do not touch integers bigger than 64-bits. |
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131 // Also avoid creating IVs of non-native types. For example, we don't want a |
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132 // 64-bit IV in 32-bit code just because the loop has one 64-bit cast. |
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133 uint64_t Width = SE->getTypeSizeInBits(I->getType()); |
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134 if (Width > 64 || (TD && !TD->isLegalInteger(Width))) |
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135 return false; |
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136 |
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137 // Get the symbolic expression for this instruction. |
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138 const SCEV *ISE = SE->getSCEV(I); |
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139 |
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140 // If we've come to an uninteresting expression, stop the traversal and |
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141 // call this a user. |
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142 if (!isInteresting(ISE, I, L, SE, LI)) |
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143 return false; |
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144 |
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145 SmallPtrSet<Instruction *, 4> UniqueUsers; |
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146 for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); |
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147 UI != E; ++UI) { |
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148 Instruction *User = cast<Instruction>(*UI); |
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149 if (!UniqueUsers.insert(User)) |
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150 continue; |
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151 |
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152 // Do not infinitely recurse on PHI nodes. |
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153 if (isa<PHINode>(User) && Processed.count(User)) |
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154 continue; |
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155 |
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156 // Only consider IVUsers that are dominated by simplified loop |
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157 // headers. Otherwise, SCEVExpander will crash. |
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158 BasicBlock *UseBB = User->getParent(); |
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159 // A phi's use is live out of its predecessor block. |
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160 if (PHINode *PHI = dyn_cast<PHINode>(User)) { |
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161 unsigned OperandNo = UI.getOperandNo(); |
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162 unsigned ValNo = PHINode::getIncomingValueNumForOperand(OperandNo); |
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163 UseBB = PHI->getIncomingBlock(ValNo); |
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164 } |
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165 if (!isSimplifiedLoopNest(UseBB, DT, LI, SimpleLoopNests)) |
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166 return false; |
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167 |
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168 // Descend recursively, but not into PHI nodes outside the current loop. |
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169 // It's important to see the entire expression outside the loop to get |
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170 // choices that depend on addressing mode use right, although we won't |
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171 // consider references outside the loop in all cases. |
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172 // If User is already in Processed, we don't want to recurse into it again, |
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173 // but do want to record a second reference in the same instruction. |
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174 bool AddUserToIVUsers = false; |
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175 if (LI->getLoopFor(User->getParent()) != L) { |
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176 if (isa<PHINode>(User) || Processed.count(User) || |
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177 !AddUsersImpl(User, SimpleLoopNests)) { |
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178 DEBUG(dbgs() << "FOUND USER in other loop: " << *User << '\n' |
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179 << " OF SCEV: " << *ISE << '\n'); |
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180 AddUserToIVUsers = true; |
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181 } |
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182 } else if (Processed.count(User) || !AddUsersImpl(User, SimpleLoopNests)) { |
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183 DEBUG(dbgs() << "FOUND USER: " << *User << '\n' |
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184 << " OF SCEV: " << *ISE << '\n'); |
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185 AddUserToIVUsers = true; |
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186 } |
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187 |
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188 if (AddUserToIVUsers) { |
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189 // Okay, we found a user that we cannot reduce. |
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190 IVUses.push_back(new IVStrideUse(this, User, I)); |
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191 IVStrideUse &NewUse = IVUses.back(); |
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192 // Autodetect the post-inc loop set, populating NewUse.PostIncLoops. |
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193 // The regular return value here is discarded; instead of recording |
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194 // it, we just recompute it when we need it. |
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195 ISE = TransformForPostIncUse(NormalizeAutodetect, |
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196 ISE, User, I, |
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197 NewUse.PostIncLoops, |
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198 *SE, *DT); |
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199 DEBUG(if (SE->getSCEV(I) != ISE) |
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200 dbgs() << " NORMALIZED TO: " << *ISE << '\n'); |
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201 } |
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202 } |
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203 return true; |
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204 } |
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205 |
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206 bool IVUsers::AddUsersIfInteresting(Instruction *I) { |
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207 // SCEVExpander can only handle users that are dominated by simplified loop |
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208 // entries. Keep track of all loops that are only dominated by other simple |
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209 // loops so we don't traverse the domtree for each user. |
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210 SmallPtrSet<Loop*,16> SimpleLoopNests; |
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211 |
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212 return AddUsersImpl(I, SimpleLoopNests); |
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213 } |
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214 |
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215 IVStrideUse &IVUsers::AddUser(Instruction *User, Value *Operand) { |
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216 IVUses.push_back(new IVStrideUse(this, User, Operand)); |
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217 return IVUses.back(); |
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218 } |
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219 |
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220 IVUsers::IVUsers() |
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221 : LoopPass(ID) { |
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222 initializeIVUsersPass(*PassRegistry::getPassRegistry()); |
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223 } |
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224 |
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225 void IVUsers::getAnalysisUsage(AnalysisUsage &AU) const { |
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226 AU.addRequired<LoopInfo>(); |
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227 AU.addRequired<DominatorTree>(); |
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228 AU.addRequired<ScalarEvolution>(); |
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229 AU.setPreservesAll(); |
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230 } |
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231 |
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232 bool IVUsers::runOnLoop(Loop *l, LPPassManager &LPM) { |
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233 |
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234 L = l; |
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235 LI = &getAnalysis<LoopInfo>(); |
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236 DT = &getAnalysis<DominatorTree>(); |
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237 SE = &getAnalysis<ScalarEvolution>(); |
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238 TD = getAnalysisIfAvailable<DataLayout>(); |
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239 |
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240 // Find all uses of induction variables in this loop, and categorize |
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241 // them by stride. Start by finding all of the PHI nodes in the header for |
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242 // this loop. If they are induction variables, inspect their uses. |
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243 for (BasicBlock::iterator I = L->getHeader()->begin(); isa<PHINode>(I); ++I) |
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244 (void)AddUsersIfInteresting(I); |
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245 |
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246 return false; |
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247 } |
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248 |
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249 void IVUsers::print(raw_ostream &OS, const Module *M) const { |
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250 OS << "IV Users for loop "; |
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251 WriteAsOperand(OS, L->getHeader(), false); |
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252 if (SE->hasLoopInvariantBackedgeTakenCount(L)) { |
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253 OS << " with backedge-taken count " |
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254 << *SE->getBackedgeTakenCount(L); |
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255 } |
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256 OS << ":\n"; |
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257 |
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258 for (ilist<IVStrideUse>::const_iterator UI = IVUses.begin(), |
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259 E = IVUses.end(); UI != E; ++UI) { |
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260 OS << " "; |
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261 WriteAsOperand(OS, UI->getOperandValToReplace(), false); |
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262 OS << " = " << *getReplacementExpr(*UI); |
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263 for (PostIncLoopSet::const_iterator |
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264 I = UI->PostIncLoops.begin(), |
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265 E = UI->PostIncLoops.end(); I != E; ++I) { |
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266 OS << " (post-inc with loop "; |
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267 WriteAsOperand(OS, (*I)->getHeader(), false); |
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268 OS << ")"; |
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269 } |
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270 OS << " in "; |
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271 UI->getUser()->print(OS); |
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272 OS << '\n'; |
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273 } |
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274 } |
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275 |
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276 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) |
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277 void IVUsers::dump() const { |
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278 print(dbgs()); |
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279 } |
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280 #endif |
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281 |
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282 void IVUsers::releaseMemory() { |
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283 Processed.clear(); |
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284 IVUses.clear(); |
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285 } |
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286 |
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287 /// getReplacementExpr - Return a SCEV expression which computes the |
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288 /// value of the OperandValToReplace. |
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289 const SCEV *IVUsers::getReplacementExpr(const IVStrideUse &IU) const { |
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290 return SE->getSCEV(IU.getOperandValToReplace()); |
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291 } |
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292 |
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293 /// getExpr - Return the expression for the use. |
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294 const SCEV *IVUsers::getExpr(const IVStrideUse &IU) const { |
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295 return |
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296 TransformForPostIncUse(Normalize, getReplacementExpr(IU), |
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297 IU.getUser(), IU.getOperandValToReplace(), |
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298 const_cast<PostIncLoopSet &>(IU.getPostIncLoops()), |
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299 *SE, *DT); |
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300 } |
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301 |
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302 static const SCEVAddRecExpr *findAddRecForLoop(const SCEV *S, const Loop *L) { |
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303 if (const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(S)) { |
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304 if (AR->getLoop() == L) |
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305 return AR; |
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306 return findAddRecForLoop(AR->getStart(), L); |
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307 } |
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308 |
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309 if (const SCEVAddExpr *Add = dyn_cast<SCEVAddExpr>(S)) { |
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310 for (SCEVAddExpr::op_iterator I = Add->op_begin(), E = Add->op_end(); |
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311 I != E; ++I) |
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312 if (const SCEVAddRecExpr *AR = findAddRecForLoop(*I, L)) |
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313 return AR; |
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314 return 0; |
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315 } |
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316 |
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317 return 0; |
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318 } |
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319 |
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320 const SCEV *IVUsers::getStride(const IVStrideUse &IU, const Loop *L) const { |
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321 if (const SCEVAddRecExpr *AR = findAddRecForLoop(getExpr(IU), L)) |
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322 return AR->getStepRecurrence(*SE); |
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323 return 0; |
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324 } |
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325 |
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326 void IVStrideUse::transformToPostInc(const Loop *L) { |
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327 PostIncLoops.insert(L); |
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328 } |
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329 |
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330 void IVStrideUse::deleted() { |
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331 // Remove this user from the list. |
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332 Parent->Processed.erase(this->getUser()); |
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333 Parent->IVUses.erase(this); |
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334 // this now dangles! |
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335 } |